/*
 * Copyright 2025 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.ai.edge.gallery.ui.common.chat

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.google.ai.edge.gallery.ui.theme.GalleryTheme

/**
 * Composable function to display the text content of a ChatMessageText.
 */
@Composable
fun MessageBodyText(message: ChatMessageText) {
  if (message.side == ChatSide.USER) {
    Text(
      message.content,
      style = MaterialTheme.typography.bodyLarge.copy(fontWeight = FontWeight.Medium),
      color = Color.White,
      modifier = Modifier.padding(12.dp)
    )
  } else if (message.side == ChatSide.AGENT) {
    if (message.isMarkdown) {
      MarkdownText(text = message.content, modifier = Modifier.padding(12.dp))
    } else {
      Text(
        message.content,
        style = MaterialTheme.typography.bodyMedium.copy(fontWeight = FontWeight.Medium),
        color = MaterialTheme.colorScheme.onSurface,
        modifier = Modifier.padding(12.dp)
      )
    }
  }
}

@Preview(showBackground = true)
@Composable
fun MessageBodyTextPreview() {
  GalleryTheme {
    Column {
      Row(
        modifier = Modifier
          .padding(16.dp)
          .background(MaterialTheme.colorScheme.primary),
      ) {
        MessageBodyText(ChatMessageText(content = "Hello world", side = ChatSide.USER))
      }
      Row(
        modifier = Modifier
          .padding(16.dp)
          .background(MaterialTheme.colorScheme.surfaceContainer),
      ) {
        MessageBodyText(ChatMessageText(content = "yes hello world", side = ChatSide.AGENT))
      }
    }
  }
}